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Reports iteration over the <b>keySet()</b> of a <b>java.util.Map</b> instance,
where the iterated keys are used to retrieve the values from the map. Such
iteration may be more efficiently replaced by iteration over the
<b>entrySet()</b> or <b>values()</b> (if key is not actually used). 
Similarly <b>keySet().forEach(key -> ...)</b>
can be replaced with <b>forEach((key, value) -> ...)</b> if values are retrieved
inside lambda.
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